Twice this year alone, Air Force officers entrusted with the launch keys to nuclear-tipped missiles have been caught leaving open a blast door that is intended to help prevent a terrorist or other intruder from entering their underground command post, Air Force officials have told The Associated Press.

William H. Sullivan, a veteran diplomat who oversaw the "secret war" in Laos, aided in negotiations to end U.S. military involvement in Vietnam and was the last American ambassador to Iran, has died. He was 90.